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The documentS–1Anthropic, PBC26 OCT 2026 · 421 PP.
01The original SEC filingThe authoritative source, in your browser.SEC · HTML 02Download the saved filingThe complete 421-page document, optimized for downloading.PDF · 46 MB 03Download the full researchFindings, customer examples, calculations, and source references.Markdown

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Table of Contents

Voting rights

Controlled company

Risk Factors

to  matters  submitted 

Shares of our Class A common stock are entitled to one vote 
per  share.  Shares  of  our  Class  N  common  stock  have  no 
voting  rights,  except  as  otherwise  required  by  law.  The 
share  of  our  Class  T  common  stock  has  no  voting  rights 
with  respect 
to  stockholders 
generally,  except  as  set  forth  within  our  amended  and 
restated certificate of incorporation, including with respect 
to the election of a majority of our board of directors or as 
required  by  law.  The  share  of  our  Class  F  common  stock 
will  be  entitled  to  an  aggregate  number  of  votes  that 
represents  50.1%  of  the  total  voting  power  of  our 
outstanding  shares  as  of  the  applicable  record  date  on  all 
matters  submitted  to  a  vote  of  stockholders  generally, 
including the election of the directors other than the Class T 
directors.  Shares  of  our  Class  E  common  stock  will  be 
entitled to one vote per share with respect to certain limited 
matters. 

We  are  considered  a  “controlled  company”  within  the 
meaning  of  the  Nasdaq  Global  Select  Market  corporate 
governance  requirements.  See  the  sections  titled  “Our 
Governance  Structure  and  Its  Goals,”  “Management,”  and 
“Description of Capital Stock” for additional information.

See the section titled “Risk Factors” and other information 
included in this prospectus for a discussion of some of the 
factors you should consider before deciding to invest in our 
Class A common stock.

Proposed trading symbol

“ANT” 

The number of shares of our Class A common stock, Class N common stock, Class T common stock, and Class F 
common stock that will be outstanding after this offering is based on            shares of our Class A common stock, 
           shares of our Class N common stock, one share of our Class T common stock, and one share of our Class F 
common stock outstanding as of September 30, 2026, which reflects:

•

•

•

•

•

the automatic conversion of (i) all            outstanding shares of our Series A, C-1, D-1, D-2, E-1, F-1, G-1, 
and H-1 redeemable convertible preferred stock into            shares of Class A common stock and (ii) all 
           outstanding shares of our Series B, C-2, D-3, E-2, E-3, E-4, E-5, F-2, G-2, G-3, G-4, H-2, H-3, 
and  H-4  redeemable  convertible  preferred  stock  into                      shares  of  Class  N  common  stock, 
immediately prior to the completion of this offering pursuant to the terms of our amended and restated 
certificate of incorporation (collectively, the “Preferred Stock Conversion”); 

one share of our Class F common stock that will be issued immediately prior to the completion of this 
offering to the Founder LLC (the “Class F Stock Issuance”); 

conversion  of  $ 

in  aggregate  principal  amount  of  our 
the 
outstanding  convertible  promissory  notes  into                      shares  of  Class  N  common  stock  immediately 
prior  to  the  completion  of  this  offering,  representing  shares  issuable  to  Amazon  Web  Services,  Inc. 
upon  the  completion  of  this  offering  without  causing  it  to  exceed  the  applicable  ownership  cap  (the 
“Convertible Notes Conversion”); 

the Initial Public Benefit Issuance, the shares of which (i) are considered legally outstanding, (ii) are 
not  considered  outstanding  for  accounting  purposes  while  held  by  our  wholly  owned  subsidiary,  and 
(iii) accordingly will not be reflected as outstanding in our consolidated financial statements; and

the net issuance of            shares of Class A common stock subject to RSUs for which the service-based 
vesting  condition  was  satisfied  as  of  the  date  of  this  prospectus  and  the  performance-based  vesting 
condition will be satisfied upon the effectiveness of the registration statement of which this prospectus 
forms a part, after giving effect to the withholding of            shares of Class A common stock subject to 
such RSUs to satisfy the associated estimated tax withholding and remittance obligations (based upon 
the assumed initial public offering price of $           per share, which is the midpoint of the estimated 

19

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  1. Founders’ letterp. 3SEC
  2. Defined termsp. 12SEC
  3. Prospectus summaryp. 16SEC
  4. Risk factorsp. 38SEC
  5. Management’s discussion & analysisp. 144SEC
  6. Businessp. 190SEC
  7. Governancep. 254SEC
  8. Executive compensationp. 275SEC
  9. Related-person transactionsp. 293SEC
  10. Principal & selling stockholdersp. 299SEC
  11. Capital-stock rightsp. 303SEC
  12. Shares eligible for future salep. 318SEC
  13. Underwritingp. 327SEC
  14. Auditor change & expertsp. 345SEC
  15. Financial statements & notesp. 347SEC
  16. Part II & exhibit indexp. 413SEC

How this was made

Read in full.
Kept in context.

A snapshot of the filing dated , rather than a live record of later events.

3primary reviewers
421pages reviewed
43image instances checked

The review

Three primary reviewers read non-overlapping ranges of the complete main filing. All 43 embedded image instances were transcribed and visually reviewed, including the founders’ letter, charts, and customer case studies. Financial tables were also checked visually for dates, units, and column alignment.

A separate reviewer checked the draft’s calculations, accounting interpretations, and customer qualifications. An additional check covered the later merged findings. The result is 62 findings and 21 customer examples.

The boundary

Companion contracts and other exhibits named in the filing’s index are separate documents and were not independently reviewed. Customer outcomes, technical benchmarks, forecasts, and scientific priority claims remain attributed company or customer disclosures.

The numbers

Dollar figures are U.S. dollars. H1 means the six months ended June 30; Q2 means the three months ended June 30. The 2026 interim financial statements are unaudited. Our calculations show their inputs and are labeled separately from reported values.

Blank fields stay undisclosed. Figures with different periods, conditions, or potentially overlapping scopes are kept separate. An earlier tender price is not an IPO price.

What the evidence labels mean
Reported in filing
A company disclosure, with the period and accounting basis retained.
Company estimate / company claim
An estimate or assertion attributed to the company, with its uncertainty preserved.
Our calculation
A derived figure using cited inputs. It is not a separately reported company metric.
Customer example
A selected case study, with its measurement limits. It is not representative ROI.
Proposed / conditional
A status qualifier for an arrangement that is not yet effective or depends on stated conditions.

About updates. This edition is tied to the October 26, 2026 filing. Any later revision should identify its new source date and preserve the basis of earlier claims.

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A closer look at the filing

Anthropic · Form S-1PDF 1

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Filed October 26, 2026. PDF is approximately 46 MB and opens only when requested. Section links may precede the exact cited paragraph.